MuffZ28

I have a 96zA. I think my drivers side cat is plugged. I keep getting code P0420. I went by an exhaust shop yesterday and got a qoute of $110 to repl. cat and $40 to remove it and put in a pipe. He advised against the pipe only saying it would make that side of my engine run rich and would be fouling plugs. Is he right? I want to go the cheapest easiest way, but I also dont want to hurt my car? Al Bundy (Married w/ children) needs your guys help!

AxeGrinder30thZ

Are you talking about taking off one cat and keeping on the other? If that's the case, then don't do it. If you are gonna take off one, you need to take off the other.

MuffZ28

I didnt get a quote to remove both? If so how would it run? any probs besides ses on? Do I need Sims?

chesee48

Do either both of them, or none...

Also you have emissions? Because if you do, you need the cats to pass....

MuffZ28

There are no emissions in Oklahoma. Would it run differently without my cat.

Kryckter

If you have emissions testing then keep your cats or if you have a somewhat strict inspection keep the cats. But if those are not a worry then get rid of BOTH of them. You will need to get O2 sims. Those will run you about 70 bucks for the pair. Other than that, NO it will not make it run worse! Removing the cats will only free up horsepower and make it run better!

chesee48

then remove both the cats then. I have a single cat car and i took my cat off. Best thing i couldve done. Sounds awesome too!

MuffZ28

will it run rich/lean or have any effect on engine till I get sims? I cant afford removal and sims at same time!

Kryckter

It will not make it run rich or lean. The rear O2's are only to tell you if the cat's are running effecient or not. It will throw a Service Engine Soon light until you get the sims but it will nto effect driveability or harm your gas mileage.

AxeGrinder30thZ

Pretty much what everyone else said. Just don't get one taken off. Actually, I had to get only one taken off and had to get the other done about a week later. If that case, it's ok, but you don't want to drive your car ALOT with only one cat on there. I didn't have a choice though...long story. Anywho, you'll be happier with the sound difference. It's much better!